const Base64 = {
	_keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

	encode: function (input) {
		let output = "";

		let chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		let i = 0;

		const newInput = Base64.utf8Encode(input);

		while (i < newInput.length) {
			chr1 = newInput.charCodeAt(i++);
			chr2 = newInput.charCodeAt(i++);
			chr3 = newInput.charCodeAt(i++);

			enc1 = chr1 >> 2;
			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
			enc4 = chr3 & 63;

			if (isNaN(chr2)) {
				enc3 = enc4 = 64;
			} else if (isNaN(chr3)) {
				enc4 = 64;
			}

			output =
				output +
				this._keyStr.charAt(enc1) +
				this._keyStr.charAt(enc2) +
				this._keyStr.charAt(enc3) +
				this._keyStr.charAt(enc4);
		}

		return output;
	},

	utf8Encode: function (string) {
		const newString = string.replace(/\r\n/g, "\n");
		let utftext = "";

		for (let n = 0; n < newString.length; n++) {
			const c = newString.charCodeAt(n);

			if (c < 128) {
				utftext += String.fromCharCode(c);
			} else if (c > 127 && c < 2048) {
				utftext += String.fromCharCode((c >> 6) | 192);
				utftext += String.fromCharCode((c & 63) | 128);
			} else {
				utftext += String.fromCharCode((c >> 12) | 224);
				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				utftext += String.fromCharCode((c & 63) | 128);
			}
		}

		return utftext;
	},
};

export default Base64;
